I have looked into this at some length. I have come up with quiet a lot of differences. qmail is easier to configure, a whole lot more secure and allows sers to admin their own lists (which is quite useful). It, however, is not a
sendmail replacement. It doesn't use .forward (which all of your users probably use), it doesn't use /var/spool/mail (or the incorrect /usr/mail, /var/mail or /var/spool/mail) but instead insists on putting mail in the users home directory.
It also lacks some of the more obscure features of sendmail (such as mail to newsgateways). I would say that qmail is just fine if you're the only user of your system or if you have all very educated users. qmail's license prohibits redistribution differing from the original package unless said distribution is approved by the author.
It does however work well when configured properly but is a bandwidth hog because of he way it is designed. I would initially think of a config problem if you cannot get a program to run that used to use sendmail just fine.
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